/Engine/Source/Runtime/SlateCore/Public/Layout/Geometry.h
Special case method to append a layout transform to a geometry. This is used in cases where theFGeometrywas arranged in window space and we need to add the root desktop translation. If you find yourself wanting to use this function, ask someone if there's a better way.
void AppendTransform ( const [FSlateLayoutTransform](API\Runtime\SlateCore\Rendering\FSlateLayoutTransform) & LayoutTransform )